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Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.
Contact lens wearers can also wear sunglasses, goggles, or other eye wear of their choice without having to fit them with prescription lenses or worry about compatibility with glasses. Additionally, there are conditions such as keratoconus and aniseikonia that are typically corrected better with contact lenses than with glasses.
Amateur use of VHF and UHF allocations exploded in the late 1960s and early 1970s as repeaters started going on the air. Repeater use sparked a huge interest in the 2-meter and 70-centimeter (420–450 MHz) bands; however, this interest never fully found its way into the 1.25-meter band.
The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.
USP-1 or "Tyulpan" (From Russian: Унифицированный Стрелковый Прицел, первый образец, Unifitsirovannyj Strelkovyj Pritsel, pervyj obrazets, "Unified Firearm Sight, first model, GRAU index 1P29) is a Soviet/Russian universal optic sight, used on the AK rifle family (AKMN, AK-74N, AK-74M, AK-101, AK-102, AK-105), the RPK-74N, the PKMN and the PKP ...
The X-ray tube is a type of cathode-ray tube that generates X-rays when high voltage electrons hit the anode. [ 88 ] [ 89 ] Gyrotrons or vacuum masers, used to generate high-power millimeter band waves, are magnetic vacuum tubes in which a small relativistic effect, due to the high voltage, is used for bunching the electrons.